"Over time, this growing tendency of like marrying like will only reinforce clustering and geographic sorting along class lines, giving the emerging map of social, economic, and cultural segregation even greater permanence."

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Our supplies of natural resources are not finite in any economic sense. Nor does past experience give reason to expect natural resources to become more scarce. Rather, if history is any guide, natural resources will progressively become less costly, hence less scarce, and will constitute a smaller proportion of our expenses in future years.

— Julian Simon